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NEW OPTIONS FOR WIRELINE LOGGING DEPTH DATA QUALITY IMPROVEM

Depth is the most fundamental logging parameter, tying together the vast array of logging measurements made. Depth forms the basis of essentially all aspects of our downhole industry.
Wireline depth data is derived using well- established procedures. The prime input for this measurement is either (1) calibrated measurehead wheels or (2) magnetic marked cable lengths. Corrections, typically for elastic stretch, are then applied. The models behind the various methods used are well entrenched, but in many logging situations, such as varying tension or deviation along a well path, the assumptions behind those models are compromised.
Under ideal conditions, a wireline depth accuracy of 5:, 2:, or even 1:10,000 may be achieved. But in many typical current day well situations the imprecision experienced may easily be well beyond 10 times larger. These errors can be highly variable in both magnitude and sign along the logged interval. Often the consequences of such errors are only seen long after drilling and evaluating the well.This paper suggests a number of improvement options over current methodologies, designed to lead to reduced depth data uncertainty. We review the application of calibration and verification to depth measurement and then suggest methodologies for commonly applicable corrections. W e then also review the impact that these have on the uncertainty determination.
Presently there is a lack of specific assignment of uncertainty to the depth measurement provided. By focusing on calibration and verification of depth associated measurements and more rigorous application of basic correction methodologies, quantification of the
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SPWLA 56th Annual Logging Symposium, July 18-22, 2015
NEW OPTIONS FOR WIRELINE LOGGING DEPTH DATA QUALITY IMPROVEMENT
Harald Bolt (ICT Europe), Ton Loermans, Philippe Theys (Consultant)
1
uncertainty measurements improved.
in wireline depth
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